82020779906 has 16 divisors (see below), whose sum is σ = 132580707000. Its totient is φ = 37831287168.

The previous prime is 82020779899. The next prime is 82020779909. The reversal of 82020779906 is 60997702028.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 68491600681 + 13529179225 = 261709^2 + 116315^2 .

It is not an unprimeable number, because it can be changed into a prime (82020779909) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 978011 + ... + 1058558.

Almost surely, 2^82020779906 is an apocalyptic number.

82020779906 is a deficient number, since it is larger than the sum of its proper divisors (50559927094).

82020779906 is a wasteful number, since it uses less digits than its factorization.

82020779906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2038133.

The product of its (nonzero) digits is 762048, while the sum is 50.

The spelling of 82020779906 in words is "eighty-two billion, twenty million, seven hundred seventy-nine thousand, nine hundred six".